Controlling apparatus for pneumatic dispatch systems



June 1 1926.

J. T. COWLEY CQNTROLLING APPARATUS FOR PNEUMATIC DISPATCH SYSTEMS Filed Jilly 12, 1923 3 Sheets-Sheet 1 Jurie 1 1926.

J. T. COWLEY CONTROLLING APPARATUS FOR PNEUMATIC DISPATCH SYSTEMS Filed July 12, 1923 3 ShQBtS-Shfit 2 x Q" um a w 2 Ewan/m z r 3 &

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3 Sheets-Sheet 5 (5% ri qylf Tania-$1. Cow y J. T. COWLEY CONTROLLING APPARATUS FOR PNEUMATIC DISPATCH SYSTEMS Filed July 12, 1925 June 1 1926.

157 T Rm Patented June 1, 1926.

UNETE d'lAlllfi Al till l'l JAMES T. COWLEY, OF SYRACUSE, NEW YORK, ASESIGNOR TO THE LAMSON COMEANY, OF SYRACUSE, NEW YORK, A CORPORATION OF MASSACHUSETTS.

CONTROLLING AIPJPABATU3 FOR PNEUMATIC DISPATCH SYSTEMfi.

Application filed July 12,

This invention pertains to power control apparatus for pneumatic systems and more particularly to automatic apparatusoi' the general type disclosed in the patent to Libby 968,576, August 30, 1910 wherein the opening and closing of a main valve is determined by fluid motor means actuated by pressure variations in the transmission line.

Principal objects 01' the present invention are to provide improved controlling apparatus of the above type which is sensitively responsive to slight pressure variations in the transmission line incident to the introduction of a carrier therein or its delivcry therefrom; to provide an arrangement such that the slight movement 01' the main valve diaphragm which occurs when a carrier is introduced into the transmission line will initiate the full opening movement of the main valve; to provide auxiliary means, responsive to slight drop in pressure in the transmission line, for initiating the closing of the main valve; to provide for the rapid restoration of parts to normal position after the discharge of the last carrier from a line; and in general to provide an apparatus of simple and reliable character having tow operative parts and which may be installed in a minimum of available space.

In the accompanying drawings certain embodin'ients of the invention are illustrated by way of example and in such d 'awings Fig. 1 is a plan view of preferred form of power control apparatus forming the subject matter of the present invention, the elec trical wiring connections being omitted;

Fig. 2 is a side elevation, partly in vertical section on the line 2-2 of Fig. 1, showing the operative elements of the mechanism in normal position;

Fig. 3 is a fragmentary detail view to larger scale illustrating certain electrical contacts shown in Fig. 2, but occupying a different position;

Fig. i a diagrammatic view illustrating the electrical wiring connections of the app aratus Fig. 5 is a vertical section illustrating a modilied form of the device; and

Fig. 6 is a diagram illustrating the electrical wiring connection for the device shown in Fi 5.

Reierring to that form of the device illustrated in Figs. 1 to t inclusive, the numeral 1 indicates a main casing or housing having rare.

the chamber Serial No. 851,065.

which communicates, by means of the connection 3, with the usual vacuum drum of a pneumatic transmission system.

As this drum forms no part of the present invention it is not illustrated.

lVithin the housing 1 a casing 1. is ranged.

llhis casing may constitute an integral part of the outer housing if desired, and provides a chamber 5 which communiates, by means of a connection 6, with the transmission line of the dispatch system. This transmission line is not illustnted as the present invention is not concerned with its articular form or construction.

e chamber 0 communicates with the chamber .3 by means of a small pipe 7 or other conduit furnishing a passage of limited capacity between said chambers.

A. bal

anced valve 8 of piston type is arranged Withi n the chamber 5.

This valve has heads 9, 10 which normally close corresponding openings in the upper and lower walls of the casing 41:.

."Vhenthis main valve is open,

The main valve 8 is furnished with a stem;

17 which is slid-ably guided within an openmg 111 a boss 18 forming part of a cover 19 which closes an opemng 1n the upper wall the housin 1.

The upper end of the stem is provided with an internal screw; threaded bore 20 with which a bolt 21 en gages.

The central portion of the diaphragm 16 is held between two plates 23, 2 1 which are clamped to the upper end of the stem 17 by the bolt 21.

The diaphragm divides the space between the parts 11 and 1 1 lnto upper and lower chambers 25 and 26 respectively.

The lower chamber 236 coi'nmunicates with the atmosphere by means of a small port 27.

This

port 2? may if desired normally be closed by means of a valve 181 such as shown in Fig. .5 and which will hereinatter be more lly described. The bolt 21 is provided .tial assage 28 communicating at ad with t. are chain a" by means at a port 29, while the lower end of the passage is provided with laterally extending ports 3O which normally are closed by the side Walls of the guide opening in the boss 18.

The flange 12 is provided with a lateral extension 31 at a convenient point, such extension having an internal cavity 32 freely communicating with the chamber 26 and opening to the outer atmosphere through a port 33. This port is provided with an annular valve seat with which a valve 34 cooperates. This valve is provided with a stem which constitutes the core of a solenoid 36 secured to the cover member 14 by means of a clamping bracket 37.

The outer casing 1 is provided with an upwardly extending portion furnishing a passage 38 by means of which the chamber 5 is placed in communication with the upper chamber 25, a. suitable opening 39 being formed in the diaphragm to provide an uninterrupted passage.

The cover 1 1 is ifUTDir-illCtl with an opening 10 at a suitable point and this opening is surrounded by an annular seat 11. A flexible diaphragm 4-2, constituting the niovable element of an auxiliary pneumatic Inotor, is secured against the seat 521 by means of a clamping ring l3 secured in position by means of screws it.

A bracket is secured to the central part of the diaphragm 42 by means of a clamping bolt d6, and a bracket -17 extending from the outer wall of the cover l t is so disposed as to limit downward movement of the diaphragm 42 by contact with the lower end of the bolt 46. I

One arm 4:8 of a bell crank lever is pivotally secured at the point 49 to the bracket 45. This lever is talc-ruined at the point 50 between ea 's upstanding from the clamping ring a3 and is furnished with the arm 51 whose purpose will be described hereinafter. An adjustable stop screw 52- is arranged to engage the end of the arm 1:3 to limit upward movement of the diaphragm 4-2.

The cover 14 is furnished with an upstanding boss 53 provided with a screwthreaded opening for the reception of a bushing 54. This bushing is provided with a guide opening in its end for a rod 55 constituting an xtension of the main valve stem 17. The lower end of this rod is received within a socket in the head of the bolt 21 and-is furnished with a tired collar 56 against which the lower end of a coil spring 57 bears. The upper end or this spring is housed within the bushing 54.- and bears against the inner surface of the latter. The spring is under tension and normally holds the diaphragm 16 and the valve 8 in the position shown in Fig. 2.

A bracket 58 is secured to the upper end of the stem extension 55 by means of a nut 59. A latch member 60 is carried by the bracket 58. This latch is furnished with a pair of ears 61 which are pivotally secured to the bracket 58, the parts being so disposed that the latch 60 may swing freely upward from the position shown in Fig. 2 but is limited in its downward movement by on gagement with the upper surface of the bracket.

A supporting bracket 63 is carried by the clamping ring 43 and supports a block G l ot insulating material. A lever 65 is pivoted atthe point 66 to the block 64. The upper arm of this lever is furnished with an inclined cam shoulder 67, the lever arm continuing above the shoulder and terminating at the point 68. A spring-pressed plunger 69 carried by the block 64 bears against the upper arm of the lever 65 and tends to swing it in a clockwise direction as viewed in 2., The lower arm of the lever 65 turnished with an electrical contact 70.

A. bracket 71 is also secured to the block 64 and this bracket has a depending arm T2 to which the lower end of a resilient arm 73 is secured. An electrical contact is carried by the arm 73 and is so disposed as to be opposed to the contact 70.

An adjusting screw 75 (Fig. 2) is secured in the upper part of the supporting bracket 63 and one end of a coil spring 2 6 is at tached to this adjusting screw. The opposite end of the spring is secured to the arm 48 of the bell crank lever and normally holds said arm in contact with the stop screw 52. As thus positioned the arm 51 oi the bell crank lever bears against the resilient arm 73 so as to hold the contact it away from the contact 70.

Referring more particularly to Fig. 4, one terminal of the solenoid 36 is shown as connected by means of a wire 77 to the lev 68. The other terminal of the solenoid is connected by a wire 78 to one pole of the battery 79 or other suitable source of electrical energy. The opposite pole of the battery is connected by a wire 80 to the resilient arm 73.

The operation of the apparatus is substantially as follows, it being assuujied that the parts are normally in the position shown in Fig. 2 and that no carrier is in the transmission line. Under tnese c-ircumstances a small quantity of air is constan through the pipe or passage i thus u reducing the pressure in the trauslu. siou' line, the pressure in the chamber 2 being that of the vacuum drum.

When a carrier is introduced into the transmission line the pressure therein immediately drops somewhat below normal and this tends to cause the diaphragm 16 to rise slightly. The slight upward movement of the diaphragm 16thus occasioned, While not suflicient to open the main valve 8, is enough to carry the latch 60 intoengagement with the cam shoulder 67, thus swing ing the lever 65 and bringing the contact 7 into engagement with the contact 7 1. This completes the electrical circuit through the solenoid 36 which immediately acts to open the valve 3 1 thus admitting atmospheric pressure to the under side of the diaphragm 16. The diaphragm. 16 immediately rises to its full extent thus opening the main valve 8 and permitting a rush of air through the transmission line sufflcient to move the carrier to its destination. The opening of the main valve 8 quickly reduces the pressure in the transmission line and chamber far below the pressure which is necessary to initiate the upward movement of the diaphragm 16.

As the diaphragm 16 approaches its up per limit of movement the latch 60 passes out of contact with the upper end of the lever 65, permitting the latter to return to normal position, but prior to this time the diaphragm 42 which is also subject to the low pressure in the chamber 25, moves clownwardly in opposition to the spring 7 6, thus swinging the arm 51 of the bell cranlr lever away from the resilient arm 7 3. The latter arm moves to the left as viewed in Fig. 2, and thus the contact 7ttollows the contact 70 as the latter is moved back by the lever 65 so that the parts 70 and 7 1 remain in engagement and the electrical circuit is unbroken.

When the carrier is delivered from the transmission line, the pressure in the latter increases slightly above the pressure of the vacuum drum and with a proper adjustment of the spring 76, this slight increase in pressure is suificient to allow the diaphragm 4-2 to resume its normal position. This moves the arm 51 into engagement with the resilient arm 7 3 and immediately breaks the circuit through the contacts 70 and 74, this deenergizing the solenoid and permitting valve 3 1 to close.

As the diaphragm 16 was raised, the lower end of the bolt 21 was moved upwardly until the ports were disposed above the upper end of the boss 18 so that a continuous passage was provided between the chamber 25 and the chamber 26. Upon closing the valve 34: as above indicated, air from beneath the diaphragm 16 is gradually drawn upwardly through the ports 30, the passage- 28, and the port 29 until the pressure beneath the diaphragm is substantially the same as that above it. The spring 57 now acts to restore the diaphragm 16 to its normal position. During the latter part of the downward movement of the diaphragm and after the ports 30 have again been closed, the air within the chamber 26 is permitted to leak out of the small port 27 so as to permit complete restoration or the. diaphragm 16 to its normal position. As the stem moves down the latch engages the upper end 68 ot' the lever but swings freely up until it passes shoulder 67 when it drops to normal position.

lVith the arrangement above described the main valve 8 is automatically opened upon the very slight decrease in pressure incident to the introduction of a carrier into the transmission line and is closed by the relatively slight increase in pressure over the transmission pressure due to the discharge ot a carrier from the line.

.A. modified form of the apparatus is disclosed in the Figs. 5 and 6. In these figures the numeral indicates the main outer casing, having the chamber 101. The inner casing 103 provides the chamber 104- which communicates by means of a passage 105 with the transmission line, not shown. The chamber 101 of the outer casing communicates in the usual manner with the vacuum drum of the system. I

The main valve 106, provided with the spaced heads 10?, 108 respectively, normally closes openings in the upper and lower walls 01? the inner casing 103. A small passage 100 through the'lower head 108 01" the valve provides for the passage of a small quantity of air from the chamber 104 to the outer chamber 101. The valve 106 is provided with a stem 110 suitably guided in an opening in the upper Wall 111 of the outer housing or casing 100.

The wall 111 is furnished with an outstanding flange portion providing a seat for the edges of a flexible diaphragm 112 which is clamped to the seat by a cover member 113. The diaphragm separates the spaces between the cover 113 and the wall 111 into upper and lower chambers 114 and 115 respectively. The chamber 101 communicates with the chamber 11 1 by means of a passage 116 which opens through the diaphragm at the point 118.

The central part of the diaphragm 112is 4 held between a pair of plates 120, 121, which are secured to the stem 110 by a clamping nut 122. A rod 123 forming an extension of the stem 110 is provided with a nut 124;

at its lower end and bears against the upper end of the stem 110. A coil spring 125 surrounds the rod 123 and bears at one end against the nut 124.. The upper end of the rod 123 passes through a guide opening in a bushing 126 secured to the cover 113 and the upper end of the spring 125 bears against the inner surface of this bushing.

The cover 113 supports an auxiliary pneumatic motor comprising an upstanding annular flange 127 carried by the member 113 and a cover member 128 suitably secured to the flange and which serves to clamp a diaphragm 131 to the upper edge of the flange. This diaphragm separates the spaces between the members 128 and 113 into upper and six lower chambers 129, respectively. The lower chamber 130 is provided. with a-small port 132 communicating with the atmosphere while the upper chamber 129 is connected by a pipe 138 to the transmission line. The diauhragm 131 is furnished with a stem 13 1 guided in a bushing 136 and held in normal position by means of a coil spring 135.

The cover 113 of the main motor is furnished with an upstanding boss 13? provided with a guide bore 138 for the reception of vertically slidin rod139. A ori -g 1&0 bears against the suriace of the rod 133 and tends to retain the latter in whatever position it may be placed. The rod 131.) is furnished with an axially elongate slot 1-1-1 in its outer surface and is orovided at its upper end with a tapering linger or plug 112 of insulating material.

The upper end of the post or stenii 123 is provided with a bracket 14:, one end of which is disposed within the slot or recess 1 11. The bracliet is also turniahed with an upstanding part to which the member is secured. The member 1% is furnished with. an inclined cam surlace at its upper end as indicated at 136.

if'he main housing- 100 is furnished with a laterally extending; boss 1 L? providing); a cavity 14-53 which communi .tes freely with the chamb 115. This cavity 148 opens to the atmosphere through an annular valve mt with which a valve 145) cooperates. This valve is furnished with a stem 150 coustituting the core of a solenoid 151.

One terminal of the solenoid is connected by a wire 15.: with one pole ot a ljiattery The other pole of this battery is connected b a wire 15% with a resilient arm 1515' suitably supported by an insul l block 15m. The free extremity of this n is arranged iuunediately above the upper end of the stem 13-11- of the diaphragm 131 and is furnished with an electrical Contact element 156. A cooperating contact 157 is carried by a tlexi: ble arm 158 also mounted on the blocl; 1r The arm 158 is connected by a wire 159 with a wire 1G0 running to the other terminal. of the solenoid.

The wire 160 is also connected by means of a to a reslient arm 161 suitably supported at one end and turnished with the contact member 163 at its lower end. This contact member normally engages a cooperating contact member 16 carried by a second resilient arm The lower ends of the arms 161 and la? diverge "from each other and are disposed immediately above the upper end of the inner 14-2 in such a manner that upward moven'ient ot the latter causes it to enter between the arms 161., 162 and to separate the contacts 163, 1641-.

The arm 162 is connected by a. wire 166 with a resilient arm 16'? mounted upon an insulating block 167. The lower end of this resilient arm 167 is furnished with an elec trical contact 168, and at an intermediate point with a block 168 having an inclined cam surface engageable with the inclined surface 1 15 of the member 146. The contact 168 cooperates with a corresponding contact 169 carried by a resilient arm 170 also supported by the block 1623 and con nected by a wire 171 with the wire 154.

The lower wall of the chamber 11:) of the main motor is furnished with a small port with which a valve 181 cooperates. This valve is car 'ied by a lever 182 pivoted at 188 and provided with a countenweight 184: which tends to close the valve. A rod 185 carried by the lower plate 121 passes through the opening 180 and contacts with the valve 181, normally holding; the valve open in opposition to the weight 18 1.

The operation of this form of the device is substantially as follows, it being under stood that the parts normally occupy substantially the position shown in Fig. 5 and that no carrier is in the transmission line. When a carrier is introduced into the line, the pressure in the latter drops slightly be low normal, whereupon the diaphragm 112 immediately rises to a slight extent but not sutiicient to open the valve 106. This movement is enough however, to cause the memher 1% to press the resilient arm 16? to the left so as to bring the contact 138 into engagement with the contact 169. An elecrical circuit is thus completed through the solenoid so that. the valve 149 is opened to admit atmospheric pressure to the chamior 115. The diaphragm 112 is now able to rise freely to its full extent thus opening the main valve 106 and thereby causing; a marked decrease in pressure in the transmission line, so that the carrier is moved toward its destination. This decrease in pressure is transn'iitted through the pipe 133 to the chamber 129 ot' the auxiliarymotor and causes the diaphragi n 131 to rise. This brings the contacts 156 and 157 into engagement. During the latter part of the upward movement of the diaphragm 1.12 the member 1 1 1 comes into engagement with the upper end of the recess 1.411. in the member 139 and l thereupon the member 139 is raised until the finger 1 12 separates the contacts 163 and 164 but this separation of the contacts does not break the circuit which is now maintained between the contacts 156 and 151'.

When the carrier discharges from the transmission line and the pressure in the latter slightly increases, the d aphragm 181 immediately resumes its normal position, the spring 135 being oi suflicient strength to produce this result. The circuit is thus broken between the contacts 156 and 157, the solenoid is deenergized and the valve 149 closes.

Upon closure of the valve 149 the spring iii? 125 immediately begins to act to restore the diaphragm 112 to normal position.

As the diaphragm approaches its lower limit of movement, the member 144 engages the lower end of the recess 141, thus restoring the member 139 to normal position permitting the contacts 163 and 164 to engage and at the same time redrawing the member 1-l6 from the member 168 so as to allow the contacts 168 and 169 to separate. The parts are thus restored to normal position ready for a subsequent operation.

I claim 1. A power control apparatus for a pneumatic transmission line comprising a main valve, a motor for actuating it, and a con trolling valve for admitting pressure fluid to the motor, said motor being constructed and arranged upon decrease in pressure in the transmission line incident to introduction of a carrier into the latter, to open said controlling valve.

2. Power control apparatus for a pneumatic transmission line comprising a main valve and a motor for operating it, said motor having a pressure actuated element exposed on one side to reduced pressure, a valve for admitting pressure fluid to the other side of said element, means for actuating the valve, and means operable by-said pressure actuated. element, upon decrease 1n normal pressure in thetransmission line, for initiating operation of the valve actuating means.

3. A power control apparatus for a pneumatic transmission line comprising a main valve, a motor for actuating it, a controlling valve for admitting pressure fluid to the motor, and electro-magnetic means for actuating the controlling valve, the motor being constructed and arranged to complete an electrical circuit through the electro-magnetic means upon slight decrease in pressure. in the transmission line.

4. Power control apparatus for a pneu-' matic transmission line comprising, a fluid motor having a movable element, a valve for controlling the operation of the motor, means operable by slight initial movement of the movable element of the motor for opening the valve, and other means, inclependent of the motor, for determining closing of the valve. i I

5. Power control apparatus for pneumatic dispatch systems comprising a motor having a reciprocable element, a normally closed controlling valve for the motor, an electro magnetic device for opening said valve, an electrical circuit including said electro-magnetic device, a switch device for closing the circuit, and a switch actuator movable by the reciprocable element of the motor, said actuator first engaging the switch device to close the circuit and then after an interval disengaging the switch device as the reciprocable element of the motor approaches its limit of movement in one direction.

6. Power control apparatus for a pneumatic transmission line comprising a pneumatic motor having adiaphragm exposed upon one si to to transmission line pressure, a valve for admitting atmospheric pressure to the opposite side of the diaphragm, an electro-magnetic device for actuating the valve, and means operable to energize said electro-magnetic means upon slight movement of the diaphragm due todecrease in pressure in the transmission line.

7. Power control apparatus for a pneumatic transmission line comprising a motor having a pressure actuated element exposed on one side to transmission line pressure, a valve for admitting pressure fluid to the other side of said element, electro-magnetic means for actuating the valve, and means operable by the pressure actuated element for initiating operation of the electromagnetic means to open the valve when pressure in the transmission line drops slightly below normal.

8. Power control apparatus for a pneumat-1c transmission line comprising a motor having a pressure actuated element, a valve for controlling the motor, electro-magnetic means for actuating the valve, a circuit closer operating upon movement of the pres sure actuated element of the motor to close an electrical circuit to energize the electromagnetic means, a circuit breaker, and means for operating the circuit breaker.

9. Powercontrol apparatus "for pneumatic systems comprising a m-21in valve, a pneumatic main motor, a controlling valve for admitting fluid pressure to the motor to actuate the main valve, electro-magnetic means for actuating the controlling valve, an auxiliary fluid motor having a diaphragm freely movable in accordance with pressure fluctuations in the system, and a circuit breaker connected to the diaphragm and acting to determine de-energization of the electro-magnetic means.

10. Power control apparatus for a pneumatic transmission line comprising a fluid motor having a movable diaphragm a valve for admitting pressure fluid to one side of the diaphragm, electro-magnetic means for opening the valve, an electrical circuit including the electro-n1agnetic means, means operable by the diaphragm for closing said circuit, and other means operable by varia tion in pressure in the transmission line for opening the circuit.

11. Power control apparatus comprising a normally closed main valve, 2. motor for opening it, a controller for determining op oration oi the motor, electro-magnetic means for actuating the controller, an auxiliary motor having a pressure sensitive element responsive to fluctuations in pressure in the 1 iii) system, and means operable by said pressure sensitive element to ole-energize said electro-magnetic means upon a predetermined change in pressure in the system.

12. Power control apparatus for pneumatic systems comprising a normally closed main valve, a main pneumatic motor for opening the main valve, a controlling valve for the main m'otor, electro-magnetic means for actuating the controlling valve, an auxiliary pneumatic motor having a. diaphragm movable in accordance with pressure variations in the system, and a circuit breaker actuable by said auxiliary motor to deenergize the electromagnetic means.

13. In a device of the class described a motor having a diaphragm, a valve to admit pressure fluid to one side of the diaphragm; an electroanagnetic device "for opening the valve, means operative during the early portion only of movement of the diaphragm to close an electrical circuit throug- 1 the electromagnetic means, and independent motor means for keeping such ci cuit closed during the completion of the movement of the diaphragm.

14-. Power control apparatus for a pneumatic transmission line comprising a motor having a diaphragm provided with a stem, a valve controlling the admission of pressure fluid to one side oi the diaphragm, electro-magnetic means for openin the valve, an electrical circuit including said electromagnetic means, relatively n'iovable contacts included in the circuit, means operative by the diaphragm upon slight movement thereof to bring the contacts into engagement and to permit separation of the contacts upon completion of movement of the diaphragm, and means for maintaining the contacts in engagement when the diaphragm actuated means becomes ineffective for the purpose.

15. In apparatus of the class described a motor having a diaphragm provided with a sliding stem, a valve controlling operation of the 1notor,.an electromagnetic device for actuating the valve, a movable circuit closer, and a part moving with the stem and engageable with the circuit closer to close an electrical circuit through the electro-magnetic device as movement of the diaphragm is initiated, said part being disengaged from the circuit closer as the diaphragm approaches its limit of movement. i

16. In a device of the class described a motor having a diaphragm, a valve for controlling the motor, electro-magnetic means to. actuate the valve, a device operable upon slight movement of the diaphragm to close an electrical circuit through the electromagnetic means, said device becoming in operative as the diaphragm continues its movement, an auxiliary motor, and means actuated by the latter to maintain the circuit closed during completion of the diaphragms movement.

17. Power control apparatus for a pneumatic transmission line comprising a fluid motor having a diaphragm exposed on one side to transmission line pressure, a valve for admitting atmospheric pressure to the opposite side of the diaphragm, electrounagnetic means for opening the valve, relativelymovable contact elements normally spaced but engageable to complete an electrical circuit through the electro-magnetic means, and means actuable by the diaphragm for moving the contact elements into engagement.

18. In apparatus of the class described, electrical controlling means comprising a pivoted lever having a cam shoulder and provided with an electrical contact, a resilient'member provided with a cooperating contact, spring means tending to hold the contacts out of engagement, means engage able with the cam shoulder for swinging the lever to bring the contacts into engagement, and other means acting upon the resilient member and normally tending to hold its contact out of engagement with the contact carried by the lever.

1.9. In apparatus of the class described a motor having a diaphragm provided with a stem, electrical means for controlling operation of the motor, a lever pivotally supported adjacent to the path of movement oi the stem, said lever having a projecting shoulder, a member carried by the stem engageable with. said shoulder to swing the lever as the diaphragm initiates its movement, a contact element carried by the lever, and a second contact engageable by the first contact upon swinging of the lever to complete an electrical circuit to actuate the motor controlling means.

20. In an apparatus of the class described a motor having a diaphragm provided with a stem, electrically operated means for controlling the motor, a movable supporting element having an inclined camshoulder, a part carried by the stem and engageable with said shoulder for moving the supporting element as the diaphragm initiates its movement, said part disengaging the shoulder as movement of the diaphragm continues, a contact carried by the supporting element, and a second contact engageable with the first contact by the aforesaid movement of the supporting element to close an electrical circuit to actuate the controlling means,

21. In apparatus of the class described a fluid motor having a diaphragm provided with a sliding stem, electrically operated controlling valve for the motor, a pair of contacts relatively movable to complete an electrical circuit to actuate the controlling valve, and a latch device carried by the stem and operable in one direction only of movement of the stem to bring said contacts into engagement.

22. Power control apparatus for a pneumatic transmission line comprising a pneumatic motor having a diaphragm provided with a sliding stem, electrical controlling means for the motor comprising a valve, electro-magnetic valve actuating means, and a movable electrical contact for completing a circuit through the electromagnetic means,

and means "for moving the contact compris ing a pivoted latch member carried by the stem, said latch member being constructed and arranged to move the contact as the stem slides in one direction, and to be inoperative as the stem moves in the opposite direction.

In apparatus of the class described, electrical controlling means comprising a pivoted lever having an outstanding cam shoulder and carrying an electrical contact, a movable member having a cooperating contact, spring means reacting upon said lever and movable member respectively and tend ing to maintain the contacts out of engage ment, a pair of pneumatic motors, means operable by one motor during continuous operation thereof first to engage the outstanding cam shoulder temporarily to swing the lever to engage the contacts and subsequently to disengage said shoulder, and means operable by the other motor for actuating the movable member to maintain engagement of the contacts after release of the lever from actuation by the first motor.

24-. Apparatus otthe class described having a main motor and auxiliary motor, electrical means for controlling the main motor comprising a pivoted lever carrying an elec trical contact, a resilient arm provided with a cooperating contact, a spring controlled lever normally pressing against the resilient arm to move its contact away from that carried. by the first lever, means actuated by the main motor for moving the first lever to engage the contacts, and means connecting the auxiliary motor with the spring controlled lever to move the latter away from the resilient arm thereby to permit the latter to carry its contact toward the contact of the means for the motor comprising a pivoted lever having an arm provided with a cam shoulder projecting into the path of move ment 01' a part carried by the sliding stem, an electrical contact carried by the lever, a resilient support provided with a cooperable contact, a spring actuated bell crank lever having one arm bearing against the resilient support to press the latter away from the first named lever, an auxiliary pneumatic motor connected to the bell crank lever, said motor being arranged to draw the bell cranli lever away from the resilient support to allow the latter to move toward the first named lever, and means connecting the auxiliary motor with the transmission line to permit variations in pressure in the line to actuate the motor.

26. Power control apparatus provided with a main valve, and a motor for operating it,.the motor comprising a diaphragm, a stem connecting the diaphragm with the valve, and a guide for the stem, the stem having an axial passage provided with ports opening at opposite sides of the diaphragm all of the ports at one side of the diaphragm normally being closed by portions of the guide.

Signed by me at Syracuse, New York, this third day of July, 1923.

JAMES T. COVJLEY.

lit). 

